White Mountains Insurance Group Ltd (WTM)
White Mountains Insurance Group Ltd (WTM) Insider Trading
Directors, officers and holders of more than 10% of WTM report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 48 most recent of 48 transactions on file: 0 with code P, 4 with code S and 44 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 31, 2026 | Tanner David Allen | Director | G Gift | 2 | Not measured | Not measured |
| Aug 26, 2026 | Klar Stephen | Director | A Award | 113 | Not measured | Not measured |
| May 21, 2026 | Gelston Philip A | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | Hicks Weston M | Director | A Award | 190 | Not measured | Not measured |
| May 21, 2026 | SHANK SUZANNE F. | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | Tanner David Allen | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | CAMPBELL REID TARLTON | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | Carlson Peter M | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | CHOKSI MARY C | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | Chu John | Director | A Award | 135 | Not measured | Not measured |
| May 21, 2026 | Dillon Margaret | Director | A Award | 135 | Not measured | Not measured |
| Mar 19, 2026 | SEELIG ROBERT LAWRENCE | EVP & General Counsel | G Gift | 50 | Not measured | Not measured |
| Mar 4, 2026 | Tanner David Allen | Director | G Gift | 225 | Not measured | Not measured |
| Feb 25, 2026 | Caffrey Liam P | Chief Executive Officer | A Award | 1,500 | Not measured | Not measured |
| Feb 25, 2026 | SEELIG ROBERT LAWRENCE | EVP & General Counsel | A Award | 775 | Not measured | Not measured |
| Feb 25, 2026 | Harrison Giles E | President | A Award | 775 | Not measured | Not measured |
| Feb 25, 2026 | Hildreth Michaela | MD & Chief Accounting Officer | A Award | 600 | Not measured | Not measured |
| Feb 25, 2026 | Papamichael Michael A | Chief Financial Officer | A Award | 500 | Not measured | Not measured |
| Jan 1, 2026 | SEELIG ROBERT LAWRENCE | EVP & General Counsel | F Tax Payment | 398 | $2078.03 | $827,056 |
| Jan 1, 2026 | Papamichael Michael A | Chief Financial Officer | F Tax Payment | 131 | $2078.03 | $272,222 |
| Jan 1, 2026 | Hildreth Michaela | MD & Chief Accounting Officer | F Tax Payment | 274 | $2078.03 | $569,380 |
| Jan 1, 2026 | Caffrey Liam P | Chief Executive Officer | F Tax Payment | 425 | $2078.03 | $883,163 |
| Dec 23, 2025 | Hildreth Michaela | MD & Chief Accounting Officer | G Gift | 60 | Not measured | Not measured |
| Dec 19, 2025 | CAMPBELL REID TARLTON | Director | S Sale | 5,000 | $2050.00 | $10,250,000 |
| Dec 19, 2025 | Rountree George Manning | Chief Executive Officer | S Sale | 5,000 | $2050.00 | $10,250,000 |
| Dec 19, 2025 | CAMPBELL REID TARLTON | Director | S Sale | 5,000 | Not measured | Not measured |
| Dec 16, 2025 | Gelston Philip A | Director | S Sale | 165 | $2048.51 | $338,004 |
| Nov 25, 2025 | CAMPBELL REID TARLTON | Director | G Gift | 50 | Not measured | Not measured |
| Nov 10, 2025 | Tanner David Allen | Director | G Gift | 4 | Not measured | Not measured |
| May 22, 2025 | SHANK SUZANNE F. | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | CAMPBELL REID TARLTON | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | Carlson Peter M | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | CHOKSI MARY C | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | Dillon Margaret | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | Gelston Philip A | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | Hicks Weston M | Director | A Award | 210 | Not measured | Not measured |
| May 22, 2025 | Tanner David Allen | Director | A Award | 150 | Not measured | Not measured |
| May 22, 2025 | Yi Steven | Director | A Award | 150 | Not measured | Not measured |
| Feb 26, 2025 | Hildreth Michaela | MD & Chief Accounting Officer | A Award | 625 | Not measured | Not measured |
| Feb 26, 2025 | SEELIG ROBERT LAWRENCE | EVP & General Counsel | A Award | 825 | Not measured | Not measured |
| Feb 26, 2025 | Rountree George Manning | Chief Executive Officer | A Award | 1,625 | Not measured | Not measured |
| Feb 26, 2025 | Harrison Giles E | President | A Award | 900 | Not measured | Not measured |
| Feb 26, 2025 | Caffrey Liam P | Chief Executive Officer | A Award | 1,025 | Not measured | Not measured |
| Jan 1, 2025 | Caffrey Liam P | Chief Executive Officer | F Tax Payment | 420 | $1945.06 | $816,925 |
| Jan 1, 2025 | Rountree George Manning | Chief Executive Officer | F Tax Payment | 1,067 | $1945.06 | $2,075,379 |
| Jan 1, 2025 | SEELIG ROBERT LAWRENCE | EVP & General Counsel | F Tax Payment | 496 | $1945.06 | $964,750 |
| Jan 1, 2025 | Hildreth Michaela | MD & Chief Accounting Officer | F Tax Payment | 323 | $1945.06 | $628,254 |
| Nov 29, 2024 | Hildreth Michaela | MD & Chief Accounting Officer | G Gift | 75 | Not measured | Not measured |
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.